Roaming Pokémon

As opposed to the stationary Set Encounters, Roaming Pokémon run around the whole region and are found in the wild with an extremely slim chance. This encountering method is exclusive to Legendary and Mythical Pokémon only.

Mechanics
In core series games, Roaming Pokémon had 2 notorious habits: they would constantly teleport from route to route and immediately try to flee when encountered, keeping their health and status conditions if they are damaged before successfully retreating. However, in Pokémon Brick Bronze, they instead have an encounter rate of 1/1000 (0.1%) on all locations with wild Pokémon battles, including caves which, in main series games, hardly allowed Roaming Pokémon to show up. They will also battle the player instead of attempting to escape in the first turn, in sharp contrast to their behaviour in the core series. As of now, all Roaming Pokémon appear at Lv.40.

Roaming Pokémon are also no longer "One chance only" -- if the player is very lucky, he or she can encounter the same Roaming Pokémon multiple times, and defeating Roria League is not required to make Roaming Pokémon show up again if any of them is defeated. As a result of this change, status conditions no longer remain on Roaming Pokémon if the player fails to catch them. Nevertheless, with the rarity being 0.1%, players are still strongly recommended to save immediately after successfully catching a Roaming Pokémon. Saving before searching for one is also recommended to preserve Poké Balls and Repels, in case the attempt of capturing ends up in failure.

Game Pass and Ro-Power
From the Aredia City update on 20th January, 2017 onwards, a Ro-Power of quadrupling the Roaming Pokémon encounter rate is introduced. Its selling price is 150 Robux. It only lasts for 1 hour per each purchase, and is only available if 3 or more Roaming Pokémon encounters are triggered.

A game pass for doubling the chance for Roaming Pokémon to show up is also added. It is very expensive and costs 600 Robux, quadruple of the price for that Ro-Power, but the effect is permanent. These 2 boosts stack with each other, bringing the maximum encounter rate to 1/125 (0.8%).

Master Balls?
Master Balls can also be bought in Poké Ball Emporium, Anthian City - Shopping District starting from Aredia City update. Being the ultimate Poké Ball, Master Ball is guaranteed to catch any wild Pokémon, and for the first time in any Pokémon games, it is available for purchase. Each Master Ball costs 50 Robux and cannot be purchased in bulk, disabling the Premier Ball bonus.

For players who are poor on Robux, they can buy Quick Balls and use them immediately when a Roaming Pokémon shows up, because Quick Balls have 5x catch rate in the first turn. In case Quick Balls fail, Elemental Balls are also good back-ups, using the Roaming Pokémon's type to players' advantage. When players are battling Roaming Pokémon overnight or in caves, Dusk Balls are the best option with the 3.5x catch rate.

Default Roaming Pokémon
These Pokémon can only be encountered as Roaming Pokémon. No Set Encounters are available for them. To trigger their Roaming encounters, players must first visit a certain location.

Roam After Set Encounters
The following Pokémon roam around Roria after battling in their Set Encounters, regardless of the result. Due to the extremely low encounter rate, players should catch them during the Set Encounters rather than treating Roaming battles as second chances.